fix sales order code to pass the tests again

api/web.py

@@ -244,15 +244,13 @@ def run_sales_order_generation():
     tenants = flask.request.json.get("tenants", None)
     tenant_query = session.query(Tenant)
 
-    if tenants is not None:
-        try:
+    if isinstance(tenants, list):
         tenant_query = tenant_query.filter(Tenant.id.in_(tenants))
         if tenant_query.count() == 0:
+            # if an explicit list of tenants is passed, and none of them
+            # exist in the db, then we consider that an error.
             return 400, {"errors": ["No tenants found from given list."]}
-        except TypeError:
-            # TODO: make an invalid parameters helper function
-            return 400, {"invalid parameters": {"tenants": "Must be a list."}}
-    else:
+    elif tenants is not None:
         return 400, {"missing parameters": {"tenants": "A list of tenant ids."}}
 
     # Handled like this for a later move to Celery distributed workers

tests/test_api.py

@@ -60,7 +60,9 @@ class TestApi(test_interface.TestInterface):
         now = datetime.now().\
             replace(hour=0, minute=0, second=0, microsecond=0)
         helpers.fill_db(self.session, 7, 5, now)
-        resp = self.app.post("/sales_order")
+        resp = self.app.post("/sales_order",
+                             params=json.dumps({}),
+                             content_type='application/json')
         resp_json = json.loads(resp.body)
 
         self.assertEquals(resp.status_int, 200)